package io.joyrpc.context;

/*-
 * #%L
 * joyrpc
 * %%
 * Copyright (C) 2019 joyrpc.io
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import java.util.Map;

/**
 * 环境变量提供者
 */
@FunctionalInterface
public interface EnvironmentSupplier {

    int SYSTEM_ORDER = 100;

    int COMMAND_ORDER = SYSTEM_ORDER + 10;

    int SPRING_ORDER = COMMAND_ORDER + 10;

    /**
     * 提供的环境变量
     *
     * @return 环境变量
     */
    Map<String, String> environment();

}
